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Prevent Installing New Plugins and Themes

Removes the ability to install or upload new plugins and themes for every user, while still allowing updates of what is already installed.

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Code

add_filter( 'map_meta_cap', function ( $caps, $cap ) {
    if ( in_array( $cap, array( 'install_plugins', 'install_themes', 'upload_plugins', 'upload_themes' ), true ) ) {
        return array( 'do_not_allow' );
    }

    return $caps;
}, 10, 2 );

Notes

Deactivate the snippet when you need to install something.

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  2. Use snippet above adds it from the library in one click. Or copy the code into a new snippet with the same code type.
  3. It is added inactive: review the code and settings, then switch it on.

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